Kioxia's 848.7 billion yen margin book runs into six-month settlement deadlines

A fall from 37,566 yen to 18,735 yen is 50.1% ^[14]. Nikkei's loss estimate is far smaller in proportion: 48.3 billion yen ^[7] against 848.7 billion yen of cost ^[6] is about 5.7% ^[15], leaving the open positions worth roughly 800 billion yen ^[16]. I think the gap comes from when the positions were opened. The stock rose nearly 400% ^[3], with the gains concentrated between April and June ^[5]. So the book mixes shares bought partway up with shares bought near the top, and buyers who averaged down on the way back ^[9] pulled the blended cost lower. Positions opened in the last week of June, when the balance peaked ^[5], reach six months in late December ^[17]. That is the start of the window, from year-end into early next year, that Tomoichiro Kubota, senior market analyst at Matsui Securities, described to Nikkei ^[11].

The heavy losses sit with the June cohort. One Tokyo investor in their 40s, identified by Nikkei as A, bought on margin in June and added on the way down. A's split-adjusted average is 31,000 yen, against a 19,120 yen close on October 5 ^[19]. The paper loss is approaching 11 million yen, and the deadline is in December ^[20]. "I'm hoping the price rises at least a little by then," A told Nikkei. "I gave up on recovering my principal long ago. I'd count myself lucky if I can get out with a loss of around 5 million yen." ^[21] The loss is proportional to the gap between cost and price. Taking it from 11 million yen to 5 million yen means closing an 11,880 yen gap to about 5,400 yen, a share price near 25,600 yen and about 34% above the October 5 close ^[22]. The share counts in the account do not match the loss: 300 shares at that gap come to about 3.6 million yen ^[23], while 11 million yen implies about 926 shares ^[24]. The figures would fit share counts quoted before the split.

The paths split three ways. If rising memory prices keep lifting earnings forecasts ^[13] and the shares reach the mid-20,000s before December, the June buyers close at losses they can live with and the selling is spread over a rally. A price stuck near 19,000 yen brings those positions due under water, and Kubota told Nikkei that without enough recovery more investors will sell at a loss and add downward pressure ^[11]. A further fall enlarges the balance that has to be settled, because holders buy more on down days ^[9].

I'd expect the deadlines to cap rebounds more than to set off a collapse. Nikkei names the margin book as the main weight on the shares ^[4], and the October 1 session showed holders using a rally to sell ^[9]. Nikkei's figures, as reported, do not include daily turnover, so the deadline supply cannot be measured against how much Kioxia trades. The case against comes from the brokerages, whose targets above the record are about twice the October 6 close ^[18]. If the earnings upgrades arrive before the spring positions clear, the damage shrinks to a timing loss for the June buyers. The view is wrong if the margin balance falls through a rally that keeps going, since that would show the supply being absorbed before it comes due.